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A kind of nanoparticle modified acrylate emulsion and its preparation method and application
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A technology of acrylate and nanoparticles, applied in coatings, anti-corrosion coatings, etc., can solve the problems of increasing water sensitivity and corrosion of dry coating films, and achieve good anti-flash rust effect, good anti-flash rust performance, and anti-flash The effect of rust performance and environmental protection
Active Publication Date: 2019-05-21
HUNAN AEROSPACE SANFENG SCI & TECH CO LTD
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[0003] Flash corrosion inhibitors are usually used in traditional anti-rust emulsions, that is, small molecular salts such as anti-flash rust agents (such as sodium nitrite, sodium benzoate and sodium tetraborate) to inhibit the generation of flash corrosion, but these salts have certain toxicity and have Excellent water solubility, water soluble salts will increase the water sensitivity of the dry film, thus increasing the chance of corrosion
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Embodiment 1
[0032] Add all the monomers, 30% deionized water, and 80% emulsifier into a three-necked flask and stir at 800 rpm for 30 minutes, and set the temperature at 40°C to prepare a pre-emulsion for later use. At the same time, configure the nanoparticles into an aqueous dispersion with a mass fraction of 5%, pour it into a four-necked flask and add 40% deionized water, 20% emulsifier, and all pH buffering agents to dissolve and make a base. At this time, the temperature of the water bath is raised to 80°C, the nitrogen protection device, the mechanical stirring device, and the condensation reflux device are turned on, and 10% pre-emulsion and 40% initiator solution are added dropwise to the four-necked flask, and the temperature is kept after the addition is completed. The seed emulsion was prepared by reacting for half an hour. At this time, the remaining pre-emulsion and initiator solution are slowly added dropwise to the above-mentioned seed emulsion, and the dropwise addition i...
Embodiment 2
[0057] Reactant consumption and reaction process are the same as embodiment 1, just change the nano-silica consumption into 3 parts, the nano-modified acrylate emulsion anti-flash rust performance that obtains is the best (anti-flash rust performance sees figure 1 No. 3 sample).
[0058] Product technical indicators:
[0059] Appearance: milky white, blue light is obvious
[0060] Solid content: 42%
[0061] Mechanical stability: 3000r / min centrifugation, 15min, no precipitation
[0062] Dilution stability: dilute to 3±0.5wt%, no precipitation for 72h
Embodiment 3
[0064] Reactant consumption and reaction process are the same as embodiment 1, just change the nano silicon dioxide consumption into 5 parts, obtain the nano-modified acrylate anti-flash rust emulsion (anti-flash rust performance see figure 1 No. 4 sample).
[0065] Product technical indicators:
[0066] Appearance: milky white, blue light is obvious
[0067] Solid content: 42%
[0068] Mechanical stability: 3000r / min centrifugation, 15min, no precipitation
[0069] Dilution stability: dilute to 3±0.5wt%, no precipitation for 72h
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Abstract
The invention discloses a nanoparticle-modified acrylate emulsion and a preparation method and application thereof. By an in-situ polymerization method, nanoparticles are introduced into an acrylate emulsion to obtain the nanoparticle-modified acrylate emulsion. Through in-situ polymerization and nanoparticle modification, an environment-friendly acrylate emulsion with good flash-rust resistance is obtained. Without adding a flash-rust resistant agent into the acrylate emulsion, a good flash-rust resistant effect can be realized. In addition, mechanical stability and dilution stability of the acrylate emulsion are both improved.
Description
technical field [0001] The invention relates to a nanoparticle-modified acrylate emulsion, a preparation method and application thereof, and belongs to the field of anti-flash rust emulsions. Background technique [0002] Flash rust is the phenomenon of corrosion on the metal surface when the paint dries on the surface of the metal substrate. There is a problem of flash rust when the traditional water-based acrylate emulsion is painted on the metal substrate. The occurrence of flash rust is due to the fact that the rust spots on the metal surface are not completely removed before painting, and the rust spots themselves have a large surface tension, which makes it impossible for the paint to completely infiltrate them. Slow, unable to infiltrate the tiny pores on the metal surface, water and oxygen will undergo proton transfer reactions on the metal surface, resulting in flash rust. The formation of flash rust will cause a significant decrease in the adhesion between the pai...
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